pseudo-hallucination
/ˌs(j)uːdəʊhəˌl(j)uːsɪˈneɪʃn/Psychology
noun
An experience or phenomenon resembling or imitating an hallucination, especially an isolated, brief, and vivid sensory experience, commonly auditory or visual, occurring in the absence of any external stimulus and recognized by the subject as illusory.
Origin
Late 19th century; earliest use found in American Journal of Psychology. From pseudo- + hallucination, after German †Pseudo-Hallucination.